LT1513/LT1513-2
ELECTRICAL CHARACTERISTICS
V
IN
= 5V, V
C
= 0.6V, V
FB
= V
REF
, I
FB
= 0V, V
SW
and S/S pins open, unless otherwise noted.
SYMBOL
PARAMETER
Error Amplifier Clamp Voltage
A
V
f
Error Amplifier Voltage Gain
V
C
Pin Threshold
Switching Frequency
Duty Cycle = 0%
2.7V
≤
V
IN
≤
25V
0°C
≤
T
J
≤
125°C
T
J
< 0°C
q
CONDITIONS
High Clamp, V
FB
= 1V
Low Clamp, V
FB
= 1.5V
MIN
1.70
0.25
0.8
450
430
400
85
40
35
q
q
q
TYP
1.95
0.40
500
1
500
500
95
130
MAX
2.30
0.52
1.25
550
580
580
260
UNITS
V
V
V/ V
V
kHz
kHz
kHz
%
ns
V
V
Maximum Switch Duty Cycle
Switch Current Limit Blanking Time
BV
Output Switch Breakdown Voltage
0°C
≤
T
J
≤
125°C
T
J
< 0°C
I
SW
= 2A
Duty Cycle = 50%
Duty Cycle = 80% (Note 1)
47
V
SAT
I
LIM
Output Switch ON Resistance
Switch Current Limit
0.25
3.0
2.6
3.8
3.4
15
4
0.45
5.4
5.0
25
Ω
A
A
mA/A
A/V
∆I
IN
/∆I
SW
Supply Current Increase During Switch ON Time
Control Voltage to Switch Current
Transconductance
Minimum Input Voltage
I
Q
Supply Current
Shutdown Supply Current
Shutdown Threshold
Shutdown Delay
S/S Pin Input Current
Synchronization Frequency Range
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
For duty cycles (DC) between 50% and 85%, minimum
guaranteed switch current is given by I
LIM
= 1.33 (2.75 – DC).
0V
≤
V
S/S
≤
5V
2.7V
≤
V
IN
≤
25V
2.7V
≤
V
IN
≤
25V, V
S/S
≤
0.6V, T
J
≥
0°C
T
J
< 0°C
2.7V
≤
V
IN
≤
25V
q
q
q
q
q
q
q
2.4
4
12
0.6
5
– 10
600
1.3
12
2.7
5.5
30
50
2
25
15
800
V
mA
µA
µA
V
µs
µA
kHz
Note 2:
The I
FB
pin is servoed to its regulating state with V
C
= 0.8V.
Note 3:
Consult factory for grade selected parts.
Note 4:
The I
FB
pin is sevoed to regulate FB to 1.245V
sn1513 1513fas
3
LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
